pseu·do·nym (sōōd'n-ĭm') n. A fictitious name, especially a pen name.
[French pseudonyme, from Greek pseudōnumon, neuter of pseudōnumos, falsely named : pseudēs, false; see pseudo- + onuma, name; see n-men- in Indo-European roots.] pseu'do·nym'i·ty n., pseu·don'y·mous (sōō-dŏn'ə-məs) adj., pseu·don'y·mous·ly adv.